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Repeated illumination of engine exhaust light - is there anything I can do to clear the fault?

The emissions warning light on my 2008 Mini Cooper came on last year and after visiting our local mini dealer and being quoted £380 for a new sensor we had it replaced at a local garage for £280. Six months on the emissions light has come on shortly after filling up with fuel. Is there anything I can do to clear the fault or do I have to replace the sensor again?

Asked on 26 January 2014 by MiniChar

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